3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "Hello " . world . "!"; ?>
based on kl9N4
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant world - assumed 'world' in /in/9aQgd on line 2 Hello world!
Output for hhvm-3.10.0

Process exited with code 153.